22
May
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WYSIHTML5 is an open source rich text editor, developed by Xing, that produces non-bloated, valid HTML5 code.
The editor doesn't rely on any JS framework, it is lightweight and loads/works pretty fast.
It transforms textarea fields and provides the major stuff including text styles (bold, italic), lists, headers, inserting images or links and coloring the text.

There is speech-input (which is only displayed in Chrome) and HTML source code can be viewed with a click.
WYSIHTML5 speeds up the writing process by auto-linking the URLs and offers a secure usage by using sandboxed iframes in order to prevent identity theft through XSS.
Requirements: No Requirements
Compatibility: All Modern Browsers
19
Aug
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CLEditor is a lightweight jQuery plugin for adding WYSIWYG HTML editors on web pages.
The plugin works by converting a standard textarea element and it is cross browser.

It is fully customizable like adding/removing/updating controls, enable/disable the use of CSS and much more.
Also, the WYSIWYG editor can be controlled with a set of methods provided.
CLEditor is very well-documented and comes with optional add-ons like "table plugin (visually displays tables inserted)" and "icon plugin (for seeing the smileys inserted)".
Requirements: jQuery
Compatibility: All Major Browsers
8
Oct
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WMD is a lightweight HTML editor which is ideal for blog comments, forum posts & basic content management.
It can be implemented into any textarea with one line of code & with an extra line, live preview functionality can be implemented.

This is not a WYSIWYG editor. Rather, it is a WYSIWYM Markdown editor (what you see Is what you mean).
WMD produces clean semantic HTML, leaving presentation details like fonts and colors up to style sheets.
Markdown: a simple markup language that’s as easy to read and write as plain-text email.
Requirements: No Requirements
Compatibility: All Major Browsers
22
Feb
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Xinha is a powerful & open source HTML (WYSIWYG) editor.
It is a community-built script presenting various options for max. customization.

It has lots of plugins that can be activated like:
- Character counter
- Find & replace
- Image manager
- HtmlTidy
- Spell checker & more.
It is possible to configure which features/menus to be displayed, whether coding inside will be permitted or not & almost anything that may be needed.
Requirements: No Requirements
Compatibility: All Major Browsers
25
Dec
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Corpocrat is presenting 2 simple & handy editors:

They both convert a textarea into an editor & they are lightweight (<5kb).
Links & images are inserted with an alert window rather than a HTML popup.
And, they are free to be used in both personal & commercial projects.
Requirements: No Requirements
Compatibility: All Major Browsers